Protocol error when connecting to db with NATIVE authentication using strong 
password substitution
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                 Key: DERBY-5651
                 URL: https://issues.apache.org/jira/browse/DERBY-5651
             Project: Derby
          Issue Type: Bug
          Components: Network Server, Services
    Affects Versions: 10.9.0.0
            Reporter: Knut Anders Hatlen


If you connect to a db with native authentication using strong password 
substitution to protect the password, you'll get a protocol error:

ij(CONNECTION2)> connect 
'jdbc:derby://localhost/db;user=app;password=papp;securityMechanism=8';
ERROR 08006: A network protocol error was encountered and the connection has 
been terminated: A PROTOCOL Data Stream Syntax Error was detected.  Reason: 
0x18. Plaintext connection attempt to an SSL enabled server?

I don't think strong password substitution is intended to work with NATIVE, but 
it should probably fail more gracefully. With BUILTIN, you'll get a more 
helpful error message:

ij(CONNECTION5)> connect 
'jdbc:derby://localhost/db2;user=app;password=papp;securityMechanism=8';
ERROR 08004: DERBY SQL error: SQLCODE: -1, SQLSTATE: 08004, SQLERRMC: 
Connection authentication failure occurred. Either the supplied credentials 
were invalid, or the database uses a password encryption scheme not compatible 
with the strong password substitution security mechanism. If this error started 
after upgrade, refer to the release note for DERBY-4483 for options.

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